WO2017045362A1

WO2017045362A1 - Touchscreen and pressure touch control detection method thereof

Info

Publication number: WO2017045362A1
Application number: PCT/CN2016/074097
Authority: WO
Inventors: 王雪飞
Original assignee: 京东方科技集团股份有限公司
Priority date: 2015-09-17
Filing date: 2016-02-19
Publication date: 2017-03-23
Also published as: CN105224126A; CN105224126B; US20170357346A1

Abstract

Provided is a touchscreen and pressure touch control detection method thereof, relating to the technical field of displaying. A touchscreen comprises a touch control panel and a frame (3) surrounding sides of the touch control pane. The touch control panel comprises a display module (1) and a touch control module (2) disposed at a light-exiting side of the display module (1). The touchscreen has a display region and a non-display region surrounding the display region. At least one pressure sensor is provided between the touch control module (2) corresponding to the non-display region and the frame (3). The pressure sensor comprises a first electrode (5), a second electrode, and a piezoresistive material layer (4) provided between the first electrode (5) and second electrode. The first electrode (5) and the touch control electrode provided at the touch control module (2) are in the same layer and are of the same material. The second electrode is composed of a part of the frame (3) contacting the piezoresistive material layer (4) and located opposite the first electrode (5). The first electrode (5) and the second electrode are each connected to a touch control chip.

Description

Touch screen and pressure touch detection method thereof

Technical field

The present invention belongs to the field of display technologies, and in particular, to a touch screen and a pressure touch detection method thereof.

Background technique

The touch screen has become the main human-computer interaction means for personal mobile communication devices and integrated information terminals, such as tablet computers, smart phones, and super-notebook computers, due to its advantages of ease of operation, intuitiveness, and flexibility. According to different touch principles, the touch screen can be divided into four main types: resistive touch screen, capacitive touch screen, infrared touch screen and surface wave (SAW) touch screen. Among them, the capacitive touch screen has multi-touch function, fast response time, long service life and high transmittance, and the user experience is superior. At the same time, with the gradual maturity of the process, the yield rate is significantly improved, and the price of the capacitive screen is decreasing. At present, it has become the main technology for touch interaction of small and medium size information terminals.

Capacitive touch screens have the disadvantage of being susceptible to environmental interference. It is difficult to accurately capture the touch behavior that occurs when using gloves and fingers with water touch or when it is used outdoors in rain or snow. At the same time, the capacitive touch screen has a problem that the touch is mishandled when the finger is suspended above the touch screen due to high sensitivity. In addition, the capacitive touch screen only senses the touch position of the plane (X, Y-axis two-dimensional space) where the screen is located, and it is difficult to support the touch parameter perception perpendicular to the screen plane (Z-axis).

Summary of the invention

The technical problem to be solved by the present invention includes providing a touch screen for realizing three-dimensional multi-point touch and a pressure touch detecting method thereof for the above problems existing in the existing touch screen.

A technical solution adopted to solve the technical problem of the present invention is a touch screen including a touch panel and a frame surrounding a side of the touch panel, the touch panel including a display module and a touch module on a light emitting surface side of the display module, the touch screen having a display area and a non-display area surrounding the display area, and the touch module corresponding to the non-display area and At least one pressure sensor is disposed between the frames; wherein

The pressure sensor includes a first electrode, a second electrode, and a layer of a piezoresistive material disposed between the first electrode and the second electrode; the first electrode is in the same layer as the touch electrode on the touch module Provided and the same material; the second electrode is composed of a portion of the frame that is in contact with the layer of piezoresistive material and on the opposite side of the first electrode, and the first electrode and the second electrode are both The touch chip is connected.

Preferably, the material of the piezoresistive material layer is a composite piezoresistive material or a semiconductor piezoresistive material.

Preferably, the pressure sensor is coupled to the frame by a conductive double-sided tape.

Preferably, an optical glue for fixing the two is disposed between the display module and the touch module.

Preferably, there is one of the pressure sensors at each corner of the touch screen.

Further preferably, each of the pressure sensors is connected to the same touch chip through a connection line.

Preferably, the material of the first electrode is indium tin oxide.

Preferably, the touch screen is any one of a mobile phone, a pad, and a notebook computer.

The technical solution for solving the technical problem of the present invention is a pressure touch detection method for a touch screen, wherein the touch screen is the touch screen, and the pressure touch detection method includes:

The pressure used for the touch is detected according to the change in the distance between the first electrode and the second electrode.

Preferably, the step of detecting the pressure used for the touch according to the change of the distance between the touch module and the frame corresponding to the non-display area comprises:

The pressure data is determined by detecting the resistance change of the piezoresistive material layer between the first electrode and the frame, and the pressure used for the touch is determined.

The invention has the following beneficial effects:

In the touch screen of the present invention, at least one pressure sensor is disposed between the touch module corresponding to the non-display area and the frame, wherein one end of the pressure sensor is connected to the frame (metal, that is, ground) The other end is connected to the first electrode, and the first electrode and the frame are connected to the touch chip, and the touch pressure is detected by detecting a change of the pressure sensor, wherein the touch pressure is perpendicular to the touch screen body. The pressure, that is, the pressure detection on the Z-axis of the touch screen, that is, the touch screen of the embodiment can realize a three-dimensional (X, Y, Z-axis) multi-point touch function. Moreover, in the present invention, the first electrode is disposed in the same layer as the touch electrode and has the same material, that is, the first electrode can be formed by one patterning process with one of the driving electrode and the sensing electrode, thereby saving cost.

DRAWINGS

1 is a schematic diagram of a touch screen according to Embodiment 1 of the present invention;

2 is a schematic view showing a piezoresistive material of a touch panel according to Embodiment 1 of the present invention;

Figure 3 is a schematic view of the piezoresistive material of Figure 2 after being pressed;

4 is a schematic diagram of a touch screen and a touch chip according to Embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of a first electrode and a touch electrode of the touch screen according to Embodiment 1 of the present invention.

The reference numerals are: 1, display module; 11, backlight; 12, display panel; 2, touch module; 21, drive electrode; 22, sensing electrode; 3, frame; 4, piezoresistive material layer; 5, the first electrode; 6, optical glue.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

As shown in FIG. 1 and FIG. 4, the embodiment provides a touch screen including a touch surface. And a touch panel comprising a display module 1 (including a backlight 11 and a display panel 12) and a touch module 2 on a light emitting surface side of the display module 1 The touch screen has a display area and a non-display area surrounding the display area, and at least one pressure sensor is disposed between the touch module 2 and the frame 3 corresponding to the non-display area; The pressure sensor includes a first electrode 5, a second electrode, and a layer of piezoresistive material 4 (corresponding to a resistor) disposed between the first electrode 5 and the second electrode; the first electrode 5 and the touch The touch electrodes on the module are disposed in the same layer and have the same material; the second electrode is formed by the frame 3 contacting the piezoresistive material layer 4 and on the opposite side of the first electrode 5, and The first electrode 5 and the second electrode are both connected to the touch chip.

The touch screen of the embodiment has a traditional multi-point capacitive touch screen body in the display area, and the capacitive touch screen body is an OGS mode touch screen, which is an entity that directly interacts with the user, and the outer surface (light-emitting surface) is an anti-friction protective glass ( Cover Glass), the touch electrode is disposed on the inner surface of the protection glass (the touch electrode includes a plurality of driving electrodes 21 and a plurality of sensing electrodes 22 respectively made of a transparent conductive material along the X-axis and the Y-axis) to form an interaction A capacitance matrix that detects changes in capacitance caused by human touch. In particular, in the embodiment, at least one pressure sensor is disposed between the touch module 2 and the frame 3 corresponding to the non-display area, wherein one end of the pressure sensor and the frame 3 (metal The other end is connected to the first electrode 5, and the first electrode 5 and the frame 3 are connected to the touch chip, and the touch pressure is detected by detecting a change of the pressure sensor, wherein the touch pressure is It is relative to the pressure in the vertical direction of the touch screen panel, that is, the pressure detection on the Z-axis of the touch screen, that is to say, the touch screen of the embodiment can realize a three-dimensional (X, Y, Z-axis) multi-point touch function. Moreover, in the embodiment, the first electrode 5 is disposed in the same layer as the touch electrode and has the same material, that is, the first electrode 5 can be formed by one patterning process with one of the driving electrode 21 and the sensing electrode 22, thereby save costs.

Preferably, the piezoresistive material layer in this embodiment is made of a composite piezoresistive material or a semiconductor piezoresistive material. Specifically, as shown in FIG. 2 and FIG. 3, in the embodiment, a piezoresistive material is disposed between the first electrode 5 and the frame 3 (ie, the second electrode), and the piezoresistive material is made of a composite piezoresistive material. For example, the layer contains several conductive particles inside. (metal pellets, graphene, carbon spheres, silicon spheres, etc.). The composite piezoresistive material can be electrically conductive and have a certain resistance R. When pressure F acts on the plate, the piezoresistive material compresses, the distance between the plates decreases, and the distance of the inner conductive balls becomes smaller, thereby making the resistance smaller, that is, R-ΔR. The magnitude of the pressure is detected by measuring the change in electrical resistance between the two electrodes.

Preferably, in the present embodiment, the pressure sensor is connected to the frame 3 through a conductive double-sided tape so that there is no gap between the pressure sensor and the frame 3, and the two are fixed to each other.

Preferably, an optical glue 6 (OCA glue) for fixing the two is disposed between the display module 1 of the touch panel and the touch module 2 . The optical adhesive 6 has good light transmittance and a high transmittance.

As shown in FIG. 5, as a preferred embodiment of the present embodiment, a pressure sensor is disposed at four corner positions of the touch screen, that is, the touch screen includes four pressure sensors. Specifically, when zooming in on a picture on the touch screen, the user clicks on the picture by a finger or the like, and the four pressure sensors will be under pressure, but since the relative positions of the four pressure sensors and the touch points are not necessarily the same, The pressure of the pressure sensors is different. Therefore, it is necessary to integrate the pressures of the four pressure sensors to obtain a value to enlarge the picture. The greater the pressure, the larger the picture display. Of course, the position and the number of the pressure sensors in this embodiment are not limited to the foregoing manners, and the number of pressure sensors is preferably as large as possible, but it is still necessary to set the pressure sensors in consideration of cost and demand.

Preferably, the material of the first electrode 5 in this embodiment is indium tin oxide (InGaSnO), that is, the material of the touch electrode in this embodiment is also indium tin oxide (InGaSnO); of course, indium gallium oxide can also be used. Transparent conductive materials such as zinc (IGZO), indium zinc oxide (IZO), indium tin oxide (InSnO), nano silver, graphene, carbon nanotubes, and the like. When the size of the touch screen is a large size touch screen, the touch electrode can also adopt a metal mesh structure.

The touch screen of this embodiment is applicable to a small-sized touch display device, and may be any one of a mobile phone, a pad, and a notebook computer, or may be another display product.

Example 2:

The embodiment provides a pressure touch detection method for a touch screen. The touch screen can be the touch screen of the first embodiment. The pressure touch detection method includes:

The pressure used for the touch is detected based on the change in distance from the one electrode 5 and the frame 3 (second electrode).

Specifically, the piezoresistive material layer is made of a piezoresistive material,

According to the change of the distance between the first electrode 5 and the frame 3 (second electrode), the step of detecting the pressure used for the touch includes:

The pressure change is calculated by detecting the resistance change of the piezoresistive material between the first electrode 5 and the frame 3, and the pressure used for the touch is determined.

In this embodiment, a piezoresistive sensor is used to detect the magnitude of the touch pressure, and the touch screen can realize a three-dimensional (X, Y, Z-axis) multi-point touch function.

It is to be understood that the above embodiments are merely exemplary embodiments employed to explain the principles of the invention, but the invention is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. These modifications and improvements are also considered to be within the scope of the invention.

Claims

A touch panel includes a touch panel and a frame at least surrounding a side surface of the touch panel, the touch panel includes a display module and a touch module on a light emitting surface side of the display module, wherein the The touch screen has a display area and a non-display area surrounding the display area, and at least one pressure sensor is disposed between the touch module and the frame corresponding to the non-display area;

The pressure sensor includes a first electrode, a second electrode, and a layer of a piezoresistive material disposed between the first electrode and the second electrode; the first electrode is in the same layer as the touch electrode on the touch module Provided and the same material; the second electrode is composed of a portion of the frame that is in contact with the layer of piezoresistive material and on the opposite side of the first electrode, and the first electrode and the second electrode are both The touch chip is connected.
The touch screen according to claim 1, wherein the material of the piezoresistive material layer is a composite piezoresistive material or a semiconductor piezoresistive material.
The touch screen of claim 1 wherein said pressure sensor is coupled to said frame by a conductive double-sided tape.
The touch screen of claim 1 , wherein an optical glue for fixing the two is disposed between the display module and the touch module.
The touch screen of claim 1 wherein there is one of said pressure sensors at each corner of said touch screen.
The touch screen according to claim 5, wherein each of the pressure sensors is connected to the same touch chip through a connection line.
The touch screen according to claim 1, wherein the material of the first electrode is indium tin oxide.
The touch screen according to claim 1, wherein the touch screen is applied to any one of a mobile phone, a pad, and a notebook computer.
A pressure touch detection method for a touch screen is applied to the touch screen according to any one of claims 1 to 8; the pressure touch detection method includes:

The pressure used for the touch is detected according to the change in the distance between the first electrode and the second electrode.
The pressure touch detection method according to claim 9, wherein the step of detecting the pressure used for the touch according to the change of the distance between the touch module and the frame corresponding to the non-display area comprises:

The pressure data is determined by detecting the resistance change of the piezoresistive material layer between the first electrode and the frame, and the pressure used for the touch is determined.